Error with InstanceProxy and method with arguments passed by reference

[tampe125]

Let's say you have the following class:

class Foo
{
    public function bar($first, $second, &$third)
    {
         echo 'Hello, world!';
    }
}

You are expected to create a mock in this way:

$mock = new Foo();
$mock->($first, $second, $third);

However, if you do that, you'll get a PHP Warning, since the $third argument is not passed by reference.
I'll try to found a workaround for this, if it's possible I'll submit a pull request.